A sliding block guide corrosion wear test device and method for a corrosive environment

Abstract

This invention provides a testing device and method for corrosion and wear testing of sliding guide rails under corrosive environments. The device includes a support module, a drive module, a guide rail, a test slider, a tension sensor, a pull rod, and a test tank module. The test slider is slidably mounted on the guide rail and contains a counterweight to simulate a load. The drive module drives the pull rod to slide along the length of the guide rail. The tension sensor is connected between the pull rod and the test slider. The test tank module holds the test solution to simulate a corrosive environment. This invention features a compact overall structure, simple component installation, and a simple slider force transmission method. It can realistically simulate the corrosion and wear phenomena of the sliding guide rail moving pair under seawater conditions. Furthermore, the adjustable counterweight and replaceable test solution enable this invention to conduct corrosion and wear tests on moving pairs under different load conditions and corrosive environments.

Description

Technical Field

[0001] This invention relates to the field of wear testing technology, and specifically to a device and method for testing the corrosion and wear of slider guide rails in corrosive environments. Background Technology

[0002] The phenomenon of material loss due to wear in a corrosive environment is called corrosion wear (or simply erosion). Corrosion wear generally occurs in environments with corrosive media and is the result of the interaction of mechanical, chemical, and electrochemical factors, involving multiple disciplines such as tribology, corrosion science, metallurgy, and electrochemistry. During corrosion, on the one hand, the corrosive medium deteriorates the surface properties of the material, increasing mechanical wear; on the other hand, mechanical wear damages the protective film on the material surface, reducing its protective effect and significantly increasing the corrosion rate. Corrosion wear is a highly complex and systematic dynamic process, with the influence of factors such as the corrosive environment and materials being intricately intertwined. Corrosion wear is prone to occur on mechanical equipment that frequently operates in corrosive environments, such as mooring systems providing berthing capabilities for deep-sea equipment, landing gear for amphibious aircraft, high-impact guide rails for large marine engineering equipment, lifting guide rails for offshore drilling platforms, and related pumps or valves. With increased mechanical wear, the performance of these devices will be affected to varying degrees, and in severe cases, it can lead to equipment failure and significant economic losses. To study the corrosion wear phenomenon between moving parts on relevant mechanical equipment, corresponding corrosion wear tests must be conducted.

[0003] For existing devices used in mechanical corrosion and wear testing, several experimental devices for studying corrosion and wear have been proposed, including Chinese Patent No. 202020185206.7 "An Electrochemical Corrosion and Wear Testing Device", Chinese Patent No. 202010580061.5 "A Device and Method for Detecting Corrosion and Wear Performance of Samples under Force-Electrical Coupling", and Chinese Patent No. 201910383619.8 "A Pin-Disc Corrosion and Wear Testing Device". These devices share similar functional principles and can be used to study the corrosion and wear principles of materials. However, a drawback is the limitation in their wear methods. All these experimental devices focus on wear between the pin and the disk, and cannot be directly applied to the corrosion and wear of mechanical moving parts.

[0004] In the prior art, the paper "Corrosion and Wear Behavior of Different Pairing Materials in Aircraft Landing Gear Mechanism" uses a corrosion and wear testing device for "bushel-shaft" rotating pairs, titled "A Swinging Wear Test Stand Corrosion and Wear Solution Tank," Chinese Patent No. 201821983607.6. However, this experimental device is limited to corrosion and wear testing between rotating pairs and cannot achieve corrosion and wear testing of rotating pairs. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a test device and method for corrosion and wear of slider guide rails in corrosive environments, in order to overcome the above-mentioned deficiencies.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a sliding block guide rail corrosion and wear testing device for corrosive environments, comprising a support module, a drive module, a guide rail, a test sliding block, a tension sensor, a pull rod, and a test pool module. The support module is used to support the overall structure. The two ends of the guide rail are connected to the support module through hanger assemblies. The test sliding block is slidably mounted on the guide rail and a counterweight is installed in the test sliding block. The drive module is used to drive the pull rod to slide along the length direction of the guide rail. The tension sensor is connected between the pull rod and the test sliding block. The test pool module is used to hold the test liquid.

[0007] Furthermore, the support module includes a test platform, four columns and two crossbeams. The four columns are vertically fixed at the four corners of the test platform, and the two crossbeams are horizontally fixed between the two columns located on the same side of the test platform, with the two crossbeams arranged opposite each other.

[0008] Furthermore, the drive module includes a fixed base, a servo motor, a coupling, a motor base, a lead screw, a lead screw nut, a nut seat, a bearing seat, and two guide rods. The two ends of the fixed base are fixedly connected to two crossbeams, the motor base is fixedly installed at one end of the fixed base, and the bearing seat is fixedly installed at the other end of the fixed base. The two ends of the lead screw are rotatably connected to the motor base and the bearing seat, respectively. The servo motor is fixedly installed on the motor base, and the output shaft of the servo motor is connected to the lead screw via a coupling. The two guide rods are located on both sides of the lead screw, and their ends are fixedly connected to the motor base and the bearing seat, respectively. The nut seat is threaded onto the lead screw, and the lead screw nut is fixedly installed on the nut seat with its two sides slidably fitted onto the guide rods. The pull rod is fixedly connected to the bottom end of the lead screw nut.

[0009] Furthermore, the hanger assembly includes a channel steel crossbeam, a hanger rod, an arc-shaped rod, an extension sleeve, and fastening bolts. One end of the arc-shaped rod is rotatably connected to the crossbeam, and the other end is rotatably connected to the channel steel crossbeam. The guide rail is fixedly connected to the channel steel crossbeam. The bottom end of the hanger rod is fixedly connected to the channel steel crossbeam. The extension sleeve is fixed to the top end of the hanger rod. The fastening bolts pass through the fixed base and are threaded into the extension sleeve.

[0010] Furthermore, a partition shell is fixedly connected to the top of the test slider, an installation screw is fixed in the partition shell, the counterweight is sleeved on the installation screw, a spring nut is sleeved on the installation screw, a bushing is inserted into the bottom of the test slider, and the bushing is slidably sleeved on the guide rail.

[0011] Furthermore, the test pool module includes a base, a test pool, and a drain valve. The base is set on the test platform, the test pool is set on the base, and the drain valve is installed on the drain pipe of the test pool.

[0012] A method for testing the corrosion and wear of slider guideways in corrosive environments includes the following steps:

[0013] S1. Weigh the test slider to obtain its self-weight G0, measure the inner diameter R0 of the bushing, then assemble the support module, install the drive module and test pool module on the support module, connect the test slider to the guide rail, use the hanger assembly to mount the guide rail on the support module, connect the pull rod to the drive module, and connect the tension sensor between the pull rod and the test slider.

[0014] S2. Start the servo motor. In the state of no counterweight and no test liquid, the horizontal tension L0 borne by the test slider is detected by the tension sensor. Based on the measured horizontal tension L0 and the self-weight G0 of the test slider, the initial friction coefficient f0 between the test slider and the guide rail is selected. The calculation formula is: f0=L0 / G0.

[0015] S3. Install a counterweight of weight G1 in the test slider. Add a 3.5% NaCl solution to the test tank to simulate seawater. Then start the servo motor and use a tension sensor to detect the horizontal tension L1 borne by the test slider. After the test slider has finished sliding, measure the inner diameter R1 of the bushing. Then calculate the friction coefficient between the test slider and the guide rail at this time. The calculation formula is f1=L1 / (G1+G0):

[0016] S4. Without changing the weight of the counterweight, repeat step S3 several times to obtain several sets of R1 and f1, and then calculate the average f of f1. S and the mean R1 s The change in the coefficient of friction f between the test slider and the guide rail is then determined. S -f0, the inner diameter changes to R s -R0.

[0017] Furthermore, in steps S3 and S4, 3.5% NaCl solution is added to the test tank until the liquid level covers the bushing.

[0018] Furthermore, in steps S3 and S4, the bushing must be cleaned and dried before measuring R1.

[0019] Furthermore, in steps S1, S3, and S4, a coordinate measuring machine is used to measure the inner diameter of the bushing.

[0020] Compared with the prior art, the present invention has the following advantages:

[0021] The present invention provides a test apparatus and method for corrosion and wear testing of slider guide rails under corrosive environments. The test apparatus has a compact overall structure, simple installation of each component, and a simple slider force transmission method. It does not require complex equipment such as hydraulic sources and can realistically simulate the corrosion and wear phenomenon of slider guide rail moving pairs under seawater conditions. It solves the limitations of existing corrosion and wear test apparatuses in simulating the corrosion and wear phenomenon of moving pairs. In addition, with adjustable counterweights and replaceable test fluids, the present invention can conduct corrosion and wear tests of moving pairs under different load conditions and different corrosive environments.

[0022] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. Attached Figure Description

[0023] Figure 1 This is a three-dimensional view of the overall structure of the experimental device of the present invention.

[0024] Figure 2 This is a front view of the overall structure of the experimental device of the present invention.

[0025] Figure 3 This is a three-dimensional view of the driving module of the experimental device of the present invention.

[0026] Figure 4 This is a three-dimensional view of the installation structure of the test slider and guide rail of the test device of the present invention.

[0027] Figure 5 This is a three-dimensional view of the installation structure of the counterweight and bushing of the test device of the present invention.

[0028] Figure 6 This is a perspective view of the hanger assembly of the experimental device of the present invention.

[0029] Figure 7 This is a three-dimensional view of the connection structure of the tensile sensor in the experimental device of the present invention.

[0030] Figure 8 This is a three-dimensional structural diagram of the test pool module of the present invention.

[0031] Explanation of reference numerals in the attached figures:

[0032] 1—Test bench; 2—Column; 3—Fixed base;

[0033] 4—Servo motor; 5—Coupling; 6—Motor base;

[0034] 7—Lead screw; 8—Lead screw nut; 9—Bearing housing;

[0035] 10—Crossbeam; 11—Drain valve; 12—Base;

[0036] 13—Nut seat; 14—Test slider; 15—Bushing;

[0037] 16—Baffle shell; 17—Counterweight; 19—Fastening bolt;

[0038] 19—Guide rail; 20—Tension sensor; 21—Extended sleeve;

[0039] 22—Lifting rod; 23—Channel steel crossbeam; 24—Arc-shaped rod;

[0040] 25—Guide rod; 26—Test pool; 27—Tie rod;

[0041] 28—Spring nut; 29—Mounting screw. Detailed Implementation

[0042] like Figure 1 , Figure 2 , Figure 4 , Figure 7 As shown, this invention provides a sliding block guide rail corrosion and wear testing device for corrosive environments, including a support module, a drive module, a guide rail 19, a test slider 14, a tension sensor 20, a pull rod 27, and a test tank module. The support module supports the overall structure. The two ends of the guide rail 19 are connected to the support module via hanger assemblies. The test slider 14 is slidably mounted on the guide rail 19. A counterweight 17 is installed in the test slider 14 to simulate different loads. The drive module drives the pull rod 27 to slide along the length of the guide rail 19. The tension sensor 20 is threaded between the pull rod 27 and the test slider 14 to detect the horizontal tension on the test slider 14. The test tank module holds the test liquid. In some examples, the test liquid is a 3.5% NaCl solution to simulate a seawater environment.

[0043] Specifically, in some examples, the support module includes a test bench 1, four columns 2 and two crossbeams 10. The four columns 2 are vertically fixed at the four corners of the test bench 1, and the two crossbeams 10 are horizontally fixed between the two columns 2 located on the same side of the test bench 1 and are arranged opposite each other.

[0044] Specifically, in some examples, such as Figure 3As shown, the drive module includes a fixed base 3, a servo motor 4, a coupling 5, a motor base 6, a lead screw 7, a lead screw nut 8, a nut seat 13, a bearing seat 9, and two guide rods 25. The two ends of the fixed base 3 are fixedly connected to two crossbeams 10, respectively. The motor base 6 is fixedly installed at one end of the fixed base 3, and the bearing seat 9 is fixedly installed at the other end of the fixed base 3. The two ends of the lead screw 7 are rotatably connected to the motor base 6 and the bearing seat 9, respectively. The servo motor 4 is fixedly installed on the motor base 6. The output shaft of the servo motor 4 is connected to the lead screw 7 via the coupling 5, enabling the output shaft of the servo motor 4 to drive the lead screw 7 to rotate. The two guide rods 25... The guide rod 25 is located on both sides of the lead screw 7 and its two ends are fixedly connected to the motor base 6 and the bearing seat 9, respectively. The guide rod 25 is in the same axial direction as the lead screw 7. The nut seat 13 is threadedly fitted onto the lead screw 7. The lead screw nut 8 is fixedly installed on the nut seat 13 and its two sides are slidably fitted onto the guide rod 25. When the lead screw 7 rotates, since the nut seat 13 can only slide relative to the lead screw 7 and cannot rotate, it can drive the nut seat 13 to slide along the axial direction of the lead screw 7, thereby driving the lead screw nut 8 to slide along the guide rod 25. The pull rod 27 is fixedly connected to the bottom end of the lead screw nut 8 and can move synchronously with the lead screw nut 8.

[0045] Specifically, in some examples, such as Figure 8 As shown, the test tank module includes a base 12, a test tank 26, and a drain valve 11. The base 12 is set on the test bench 1, the test tank 26 is set on the base 12, and the drain valve 11 is installed on the drain pipe of the test tank 26. The drain pipe of the test tank 26 is installed on the bottom surface of the test tank 26. When the drain valve 11 is opened, the test liquid in the test tank 26 can be discharged from the drain pipe by itself.

[0046] Specifically, in some examples, such as Figure 6 As shown, the hanger assembly includes a channel steel crossbeam 23, a hanger rod 22, an arc-shaped rod 24, an extension sleeve 21, and a fastening bolt 18. One end of the arc-shaped rod 24 is rotatably connected to the crossbeam 10, and the other end is rotatably connected to the channel steel crossbeam 23. The guide rail 19 is fixedly connected to the channel steel crossbeam 23. The bottom end of the hanger rod 22 is fixedly connected to the channel steel crossbeam 23. The extension sleeve 21 is fixed to the top end of the hanger rod 22. The fastening bolt 18 passes through the fixed base 3 and is inserted into the extension sleeve 21 by thread engagement.

[0047] The arc-shaped rod 24 is rotatably connected to the channel steel crossbeam 23 and the crossbeam 10. Therefore, the distance between the two opposing arc-shaped rods 24 can be adjusted according to the length of the guide rail 19. After adjustment, the fastening bolt 18 is passed through the fixed base 3 and screwed into the extension sleeve 21. The arc-shaped rod 24 ensures that the guide rail 19 is completely submerged in the test pool 26, so that the guide rail 19 can be submerged after the test liquid is added.

[0048] Furthermore, in some examples, such as Figure 5 As shown, a partition shell 16 is fixedly connected to the top of the test slider 14, and an installation screw is fixed in the partition shell 16. A counterweight 17 is sleeved on the installation screw 29, and a spring nut 28 is sleeved on the installation screw 29. A bushing 15 is inserted into the bottom of the test slider 14, and the bushing 15 is slidably sleeved on the guide rail 19.

[0049] The addition of bushing 15 facilitates the measurement of wear and also protects the test slider 14. When installing the counterweight 17, first insert the counterweight 17 onto the mounting screw 29, then put the spring nut 28 onto the mounting screw 29 and tighten it. The partition shell 16 can block the test liquid in the test pool 26, preventing the test liquid from contacting the counterweight 17 and causing corrosion.

[0050] In summary, the overall working principle of this experimental device is as follows: after the servo motor 4 is started, the servo motor 4 drives the lead screw 7 to rotate, the lead screw 7 drives the nut seat 13 to slide, the nut seat 13 drives the lead screw nut 8 to slide, the lead screw nut 8 drives the pull rod 27 to move synchronously, and the pull rod 27 pulls the test slider 14 to slide along the guide rail 19. During this process, the tension sensor 20 can detect the tension on the test slider 14.

[0051] The present invention also provides a method for testing the corrosion and wear of a slider guide rail in a corrosive environment, comprising the following steps:

[0052] S1. Weigh the test slider 14 to obtain its self-weight G0, measure the inner diameter R0 of the bushing 15, and then assemble the support module. After pre-installing the drive module, test pool module and hanger assembly outside the test bench 1, install the drive module and test pool module on the support module, add the bushing 15 to the test slider 14 and install it on the guide rail 19, and use the hanger assembly to set up the guide rail 19 on the support module. Connect the pull rod 27 to the drive module 14 and connect the tension sensor 20 between the pull rod 27 and the test slider 14.

[0053] S2. Start the servo motor 4. In the state of no counterweight and no test liquid, the horizontal tension L0 borne by the test slider is detected by the tension sensor 20. Based on the measured horizontal tension L0 and the self-weight G0 of the test slider 14, the initial friction coefficient f0 between the test slider 14 and the guide rail 19 is calculated. The calculation formula is: f0=L0 / G0.

[0054] S3. Install a counterweight 17 with a weight of G1 in the test slider 14. Add a 3.5% NaCl solution to the test tank 26 to simulate seawater. The liquid level of the test tank 26 should cover the bushing 15. Then start the servo motor 4 and detect the horizontal tension L1 borne by the test slider 14 through the tension sensor 20. After the test slider 14 finishes sliding, clean and dry the bushing 15. Then measure the inner diameter R1 of the bushing 15. Then calculate the friction coefficient between the test slider 14 and the guide rail 19 at this time. The calculation formula is f1=L1 / (G1+G0):

[0055] S4. Without changing the weight of counterweight 17, repeat step S3 several times to obtain several sets of R1 and f1, and then calculate the average f of f1. S and the mean R1 s The change in the coefficient of friction f between the test slider 14 and the guide rail 19 is then determined. S -f0, the inner diameter changes to R s -R0.

[0056] In the above steps, when assembling the device, first ensure that the channel steel crossbeam 23 is in a horizontal state, and ensure that the lead screw 7, guide rod 25 and guide rail 19 are in a parallel state. Then, ensure that the guide rail 19 and bushing 15 can be completely submerged in the test pool 26.

[0057] In steps S2, S3, and S4, the servo motor 4 needs to drive the test slider 14 to slide back and forth on the guide rail 19, and the distance of each test slide needs to be the same.

[0058] When measuring wear, considering that friction between moving parts may cause plastic deformation, the wear measured by weighing method cannot accurately characterize the degree of corrosion wear. This experiment uses a coordinate measuring machine (CMM) to measure the dimensions of the test piece after wear. The magnitude of the change in dimensions before and after the test is used to characterize the wear amount. Furthermore, when using the CMM, measurements need to be taken at different positions along the entire circumference of the inner contour of bushing 15 to obtain several values. The average of these values ​​is then calculated as R0 or R1, ultimately yielding two characterizing data points for the degree of corrosion wear. S -f0 and R s -R0.

[0059] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention in any way. Any simple modifications, alterations, and equivalent changes made to the above embodiments based on the inventive essence shall still fall within the protection scope of the present invention.

Claims

1. A testing device for corrosion and wear of slider guide rails in corrosive environments, characterized in that: The system includes a support module, a drive module, a guide rail, a test slider, a tension sensor, a tie rod, and a test tank module. The support module supports the overall structure. The two ends of the guide rail are connected to the support module via hanger assemblies. The test slider is slidably mounted on the guide rail and contains a counterweight. The drive module drives the tie rod to slide along the length of the guide rail. The tension sensor is connected between the tie rod and the test slider. The test tank module holds the test liquid. The drive module includes a fixed base, a servo motor, a coupling, a motor base, a lead screw, a lead screw nut, a nut seat, a bearing seat, and two guide rods. The two ends of the fixed base are fixedly connected to two crossbeams, the motor base is fixedly installed at one end of the fixed base, the bearing seat is fixedly installed at the other end of the fixed base, the two ends of the lead screw are rotatably connected to the motor base and the bearing seat, the servo motor is fixedly installed on the motor base, and the output shaft of the servo motor is connected to the lead screw through a coupling. The two guide rods are located on both sides of the lead screw and their ends are fixedly connected to the motor base and the bearing seat, respectively. The nut seat is threaded onto the lead screw, the lead screw nut is fixedly installed on the nut seat and its two sides are slidably sleeved on the guide rods, and the pull rod is fixedly connected to the bottom end of the lead screw nut. The hanger assembly includes a channel steel crossbeam, a hanger rod, an arc-shaped rod, an extension sleeve, and fastening bolts. One end of the arc-shaped rod is rotatably connected to the crossbeam, and the other end is rotatably connected to the channel steel crossbeam. The guide rail is fixedly connected to the channel steel crossbeam. The bottom end of the hanger rod is fixedly connected to the channel steel crossbeam. The extension sleeve is fixed to the top end of the hanger rod. The fastening bolts pass through the fixed base and are threaded into the extension sleeve.

2. The sliding block guide rail corrosion and wear testing device according to claim 1, characterized in that: The support module includes a test platform, four columns and two crossbeams. The four columns are vertically fixed at the four corners of the test platform, and the two crossbeams are horizontally fixed between two columns located on the same side of the test platform, with the two crossbeams arranged opposite each other.

3. The sliding block guide rail corrosion and wear testing device according to claim 1, characterized in that: The top of the test slider is fixedly connected to a partition shell, and a mounting screw is fixed in the partition shell. The counterweight is sleeved on the mounting screw, and a spring nut is sleeved on the mounting screw. A bushing is inserted into the bottom of the test slider, and the bushing is slidably sleeved on the guide rail.

4. The sliding block guide rail corrosion and wear testing device according to claim 1, characterized in that: The test pool module includes a base, a test pool, and a drain valve. The base is set on the test platform, the test pool is set on the base, and the drain valve is installed on the drain pipe of the test pool.

5. A method for testing the corrosion and wear of slider guides in corrosive environments, based on the testing apparatus for testing the corrosion and wear of slider guides in corrosive environments as described in any one of claims 1-4, characterized in that, Includes the following steps: S1. Weigh the test slider to obtain its self-weight G0, measure the inner diameter R0 of the bushing, then assemble the support module, install the drive module and test pool module on the support module, connect the test slider to the guide rail, use the hanger assembly to mount the guide rail on the support module, connect the pull rod to the drive module, and connect the tension sensor between the pull rod and the test slider. S2. Start the servo motor. In the state of no counterweight and no test liquid, the horizontal tension L0 borne by the test slider is detected by the tension sensor. Based on the measured horizontal tension L0 and the self-weight G0 of the test slider, the initial friction coefficient f0 between the test slider and the guide rail is selected. The calculation formula is: f0=L0 / G0. S3. Install a counterweight of weight G1 in the test slider, add a 3.5% NaCl solution to the test tank to simulate seawater, then start the servo motor, detect the horizontal tension L1 borne by the test slider through a tension sensor, and measure the inner diameter R1 of the bushing after the test slider has finished sliding. Then calculate the friction coefficient between the test slider and the guide rail at this time. The calculation formula is f1=L1 / (G1+G0): S4. Without changing the weight of the counterweight, repeat step S3 several times to obtain several sets of R1 and f1, and then calculate the average f of f1. S and the mean R1 s The change in the coefficient of friction f between the test slider and the guide rail is then determined. S -f0, the inner diameter changes to R s -R0.

6. The method for testing corrosion and wear of slider guide rails in corrosive environments according to claim 5, characterized in that: In steps S3 and S4, 3.5% NaCl solution is added to the test tank until the liquid level covers the bushing.

7. The method for testing corrosion and wear of slider guide rails in corrosive environments according to claim 5, characterized in that: In steps S3 and S4, the bushing must be cleaned and dried before measuring R1.

8. The method for testing corrosion and wear of slider guide rails in corrosive environments according to claim 5, characterized in that: In steps S1, S3, and S4, a coordinate measuring machine is used to measure the inner diameter of the bushing.

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